How to use getListeners method of org.testng.DataProviderHolder class

Best Testng code snippet using org.testng.DataProviderHolder.getListeners

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...810 m_configuration.setAlwaysRunListeners(this.m_alwaysRun);811 m_configuration.setExecutorFactory(getExecutorFactory());812 }813 private void addListeners(XmlSuite s) {814 for (String listenerName : s.getListeners()) {815 Class<?> listenerClass = ClassHelper.forName(listenerName);816 /​/​ If specified listener does not exist, a TestNGException will be thrown817 if (listenerClass == null) {818 throw new TestNGException(819 "Listener " + listenerName + " was not found in project's classpath");820 }821 ITestNGListener listener = (ITestNGListener) InstanceCreator.newInstance(listenerClass);822 addListener(listener);823 }824 /​/​ Add the child suite listeners825 List<XmlSuite> childSuites = s.getChildSuites();826 for (XmlSuite c : childSuites) {827 addListeners(c);828 }...

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...713 for (int i = 0; i < parameterCount; i++) {714 String n = "param" + i;715 allParameterNames.put(n, n);716 }717 for (IDataProviderListener dataProviderListener : holder.getListeners()) {718 dataProviderListener.beforeDataProviderExecution(719 dataProviderMethod, testMethod, methodParams.context);720 }721 Iterator<Object[]> initParams;722 try {723 initParams = MethodInvocationHelper.invokeDataProvider(724 dataProviderMethod725 .getInstance(), /​* a test instance or null if the dataprovider is static*/​726 dataProviderMethod.getMethod(),727 testMethod,728 methodParams.context,729 fedInstance,730 annotationFinder);731 } catch (RuntimeException e) {732 for (IDataProviderListener each : holder.getListeners()) {733 each.onDataProviderFailure(testMethod, methodParams.context, e);734 }735 throw e;736 }737 final Iterator<Object[]> parameters = initParams;738 for (IDataProviderListener dataProviderListener : holder.getListeners()) {739 dataProviderListener.afterDataProviderExecution(740 dataProviderMethod, testMethod, methodParams.context);741 }742 /​/​ If the data provider is restricting the indices to return, filter them out743 final List<Integer> allIndices = new ArrayList<>();744 allIndices.addAll(testMethod.getInvocationNumbers());745 allIndices.addAll(dataProviderMethod.getIndices());746 Iterator<Object[]> filteredParameters =747 new Iterator<Object[]>() {748 int index = 0;749 boolean hasWarn = false;750 @Override751 public boolean hasNext() {752 if (index == 0 && !parameters.hasNext() && !hasWarn) {...

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...194 TestListenerHelper.runTestListeners(tr, m_notifier.getTestListeners());195 }196 private Collection<IDataProviderListener> dataProviderListeners() {197 ISuite suite = this.m_testContext.getSuite();198 Collection<IDataProviderListener> dpListeners = Sets.newHashSet(this.holder.getListeners());199 if (suite instanceof SuiteRunner) {200 Collection<IDataProviderListener> listeners = ((SuiteRunner) suite)201 .getDataProviderListeners();202 dpListeners.addAll(listeners);203 }204 return dpListeners;205 }206 private DataProviderHolder buildDataProviderHolder() {207 DataProviderHolder holder = new DataProviderHolder();208 holder.addListeners(dataProviderListeners());209 holder.addInterceptors(this.holder.getInterceptors());210 return holder;211 }212 /​**...

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...307 public List<IReporter> getReporters() {308 return reporters;309 }310 public Collection<IDataProviderListener> getDataProviderListeners() {311 return this.holder.getListeners();312 }313 private void runSequentially() {314 for (TestRunner tr : testRunners) {315 runTest(tr);316 }317 }318 private void runTest(TestRunner tr) {319 visualisers.forEach(tr::addListener);320 tr.run();321 ISuiteResult sr = new SuiteResult(xmlSuite, tr);322 synchronized (suiteResults) {323 suiteResults.put(tr.getName(), sr);324 }325 }...

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...8 */​9public class DataProviderHolder {10 private final Collection<IDataProviderListener> listeners = Sets.newHashSet();11 private final Collection<IDataProviderInterceptor> interceptors = Sets.newHashSet();12 public Collection<IDataProviderListener> getListeners() {13 return Collections.unmodifiableCollection(listeners);14 }15 public Collection<IDataProviderInterceptor> getInterceptors() {16 return Collections.unmodifiableCollection(interceptors);17 }18 public void addListeners(Collection<IDataProviderListener> listeners) {19 listeners.forEach(this::addListener);20 }21 public void addListener(IDataProviderListener listener) {22 listeners.add(listener);23 }24 public void addInterceptors(Collection<IDataProviderInterceptor> interceptors) {25 interceptors.forEach(this::addInterceptor);26 }27 public void addInterceptor(IDataProviderInterceptor interceptor) {28 interceptors.add(interceptor);29 }30 public void merge(DataProviderHolder other) {31 this.listeners.addAll(other.getListeners());32 this.interceptors.addAll(other.getInterceptors());33 }34}

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getListeners

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1import org.testng.annotations.DataProvider; 2import org.testng.annotations.Test; 3import org.testng.xml.XmlClass; 4import org.testng.xml.XmlInclude; 5import org.testng.xml.XmlSuite; 6import org.testng.xml.XmlTest; 7import java.util.List; 8import java.util.Iterator; 9import java.util.ArrayList; 10import java.util.Arrays; 11import java.util.HashMap; 12import java.util.Map; 13import java.util.Set; 14import java.util.HashSet; 15import java.util.Arrays; 16import org.testng.IAnnotationTransformer; 17import org.testng.IRetryAnalyzer; 18import org.testng.ITestResult; 19import org.testng.annotations.ITestAnnotation; 20import org.testng.annotations.Test; 21import org.testng.collections.Lists; 22import org.testng.annotations.DataProvider; 23import org.testng.annotations.Test; 24import org.testng.xml.XmlClass; 25import org.testng.xml.XmlInclude; 26import org.testng.xml.XmlSuite; 27import org.testng.xml.XmlTest; 28import java.util.List; 29import java.util.Iterator; 30import java.util.ArrayList; 31import java.util.Arrays; 32import java.util.HashMap; 33import java.util.Map; 34import java.util.Set; 35import java.util.HashSet; 36import java.util.Arrays; 37import org.testng.IAnnotationTransformer; 38import org.testng.IRetryAnalyzer; 39import org.testng.ITestResult; 40import org.testng.annotations.ITestAnnotation; 41import org.testng.annotations.Test; 42import org.testng.collections.Lists; 43import org.testng.annotations.DataProvider; 44import org.testng.annotations.Test; 45import org.testng.xml.XmlClass; 46import org.testng.xml.XmlInclude; 47import org.testng.xml.XmlSuite; 48import org.testng.xml.XmlTest; 49import java.util.List; 50import java.util.Iterator; 51import java.util.ArrayList; 52import java.util.Arrays; 53import java.util.HashMap; 54import java.util.Map; 55import java.util.Set; 56import java.util.HashSet; 57import java.util.Arrays; 58import org.testng.IAnnotationTransformer; 59import org.testng.IRetryAnalyzer; 60import org.testng.ITestResult; 61import org.testng.annotations.ITestAnnotation; 62import org.testng.annotations.Test; 63import org.testng.collections.Lists; 64import org.testng.annotations.DataProvider; 65import org.testng.annotations.Test; 66import org.testng.xml.XmlClass; 67import org.testng.xml.XmlInclude; 68import org.testng.xml.XmlSuite; 69import org.testng.xml.XmlTest; 70import java.util.List

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getListeners

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1package com.test;2import java.lang.reflect.Method;3import java.util.Arrays;4import java.util.List;5import org.testng.IInvokedMethod;6import org.testng.IInvokedMethodListener;7import org.testng.IRetryAnalyzer;8import org.testng.ITestContext;9import org.testng.ITestListener;10import org.testng.ITestNGListener;11import org.testng.ITestResult;12import org.testng.annotations.DataProvider;13import org.testng.annotations.Test;14import org.testng.internal.DataProviderHolder;15import org.testng.internal.TestResult;16public class TestNGTest implements ITestListener, IInvokedMethodListener {17 @Test(dataProvider = "dataProvider")18 public void test(String data) {19 System.out.println("data: " + data);20 }21 @DataProvider(name = "dataProvider")22 public Object[][] dataProvider() {23 return new Object[][] { { "data1" }, { "data2" }, { "data3" } };24 }25 public void onTestStart(ITestResult result) {26 System.out.println("onTestStart: " + result.getName());27 ITestNGListener[] listeners = ((TestResult) result).getTestContext().getSuite().getListeners();28 List<ITestNGListener> list = Arrays.asList(listeners);29 for (ITestNGListener listener : list) {30 if (listener instanceof DataProviderHolder) {31 for (ITestNGListener listener1 : ((DataProviderHolder) listener).getListeners()) {32 if (listener1 instanceof ITestListener) {33 ITestListener testListener = (ITestListener) listener1;34 for (ITestResult testResult : testListener.getConfigurationFailures()) {35 System.out.println("Configuration failure: " + testResult.getThrowable().getMessage());36 System.out.println("Stack trace: " + Arrays.toString(test

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getListeners

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1public void onTestStart(ITestResult result) {2 ITestNGMethod method = result.getMethod();3 String methodName = method.getMethodName();4 String className = method.getTestClass().getName();5 String testFullName = className + "." + methodName;6 System.out.println("Test Name : " + testFullName);7 DataProviderHolder dataProviderHolder = new DataProviderHolder();8 List<ITestNGListener> listeners = dataProviderHolder.getListeners();9 for (ITestNGListener listener : listeners) {10 if (listener instanceof IInvokedMethodListener) {11 IInvokedMethodListener methodListener = (IInvokedMethodListener) listener;12 System.out.println("Listener Name : " + methodListener.getClass().getName());13 }14 }15}

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StackOverFlow community discussions

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When you enable parallel then there will be some time between the beforeInvocation and afterInvocation in the logs as you have noticed and that difference in time varies from test to test hence the staggered output.

If what you want is the start and end messages next to each other then you are basically throwing out the time factor and as such can simply add your beforeInvocation message to the afterInvocation method as follows:

public class TestExecutionListener implements IInvokedMethodListener {

    @Override
    public void beforeInvocation(IInvokedMethod iInvokedMethod, ITestResult iTestResult) {
    }

    @Override
    public void afterInvocation(IInvokedMethod iInvokedMethod, ITestResult iTestResult) {
        System.out.println("Testing : " + iInvokedMethod.getTestMethod().getMethodName());
        System.out.println("Successfully Tested : " + iInvokedMethod.getTestMethod().getMethodName());
    }
}

IMO this is the only way to do it as per your spec. However, if there is other information that must be gathered during the tests then perhaps you could buffer some logs in the TestExecutionListener for example:

public class TestExecutionListener implements IInvokedMethodListener {
    private Map<Integer, Deque<String>> logsMap = new HashMap<Integer, Deque<String>>();

    public void log(IInvokedMethod iInvokedMethod, String log) {
        if(!logsMap.containsKey(iInvokedMethod.getId())) {
            logsMap.put(iInvokedMethod.getId(), new ArrayDeque<String>());
        }

        logsMap.get(iInvokedMethod.getId()).add(log);
    }

    @Override
    public void beforeInvocation(IInvokedMethod iInvokedMethod, ITestResult iTestResult) {
        log(iInvokedMethod, "Testing : " + iInvokedMethod.getTestMethod().getMethodName());
    }

    @Override
    public void afterInvocation(IInvokedMethod iInvokedMethod, ITestResult iTestResult) {
        log(iInvokedMethod, "Successfully Tested : " + iInvokedMethod.getTestMethod().getMethodName());

        Deque<String> logs = logsMap.get(iInvokedMethod.getId());
        while(!logs.isEmpty()) {
            System.out.println(logs.poll());
        }
    }
}
https://stackoverflow.com/questions/38987504/getting-sequential-logs-while-executing-tests-in-parallel

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